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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
If you know their name, type in https://www.codewars.com/users/their-name (= click on their name anywhere it appears) and click Follow
if you don't know the exact name, ask them somewhere else what their name is here, or use a regular search engine with something like site:codewars.com searchterm
I would like to follow my friend, but there is no way of finding him.